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Pachycondyla petiolosa
''Pachycondyla petiolosa'' is an extinct species of ants in the formicid subfamily Ponerinae described by from a fossil found in Europe. ''P. parvula'' is one of six Lutetian ''Pachycondyla'' species.
==History and classification==
When described ''Pachycondyla petiolosa'' was known from two fossil insects which are compression-impression fossils preserved in layers of soft sedimentary rock.〔 Along with other well preserved insect fossils, the ''P. petiolosa'' specimens were collected from layers of Lutetian Messel Formation rock in the Messel pit World Heritage Site. The Messel formation is composed of brown coals, oil shales, and bituminous shale, which preserved numerous insects, fish, birds, reptiles, and terrestrial mammals as a notable lagerstätten. The area is a preserved maar lake which initially formed approximately 47 million years ago as the result of volcanic explosions.
At the time of description, the holotype specimen, number SMF MeI 1893, along with the paratype SMF MeI 1427 were preserved in the Senckenberg Research Station Messel fossil collections. The fossils were described by Gennady Dlussky and Sonja Wedmann in a 2012 paper on the poneromorph ants of Messel. In the type description Dlussky and Wedmann named the species ''P. petiolosa'', with the specific epithet derived from the Latin "petiolosus", chosen in recognition of notably visible petiole.〔
The species is one of six ''Pachycondyla'' which have been described from Messel Formation fossils. All six of the species were described by Dlussky and Wedmann in the same 2012 paper, the other five being ''P. eocenica'', ''P. lutzi'', ''P.? messeliana'', ''P. parvula'', and ''P. petrosa''.〔 Another eight fossil species have been described from fossils in North America, Europe, and Asia.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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